Large Non-Gaussianity from Multi-Brid Inflation(Astrophysics and Cosmology)
スポンサーリンク
概要
- 論文の詳細を見る
A model of multi-component hybrid inflation, dubbed multi-brid inflation, in which various observable quantities including the non-Gaussianity parameter f_<NL> can be analytically calculated was proposed recently. In particular, for a two-brid inflation model with an exponential potential and the condition that the end of inflation is an ellipse in the field space, it was found that, while keeping the other observational quantities within the range consistent with observations, large non-Gaussianity is possible for certain inflationary trajectories, provided that the ratio of the two masses is large. One might question whether the resulting large non-Gaussianity is specific to this particular form of the potential and the condition for the end of inflation. In this paper, we consider a model of multi-brid inflation with a potential given by an exponential function of terms quadratic in the scalar field components. We also consider a more general class of ellipses for the end of inflation than those studied previously. Then, focusing on the case of two-brid inflation, we find that large non-Gaussianity is possible in the present model even for the equal-mass case. Then by tuning the model parameters, we find that there exist models for which both the non-Gaussianity and the tensor-to-scalar ratio are large enough to be detected in the very near future.
- 理論物理学刊行会の論文
- 2009-01-25
著者
-
SASAKI Misao
Yukawa Institute for Theoretical Physics, Kyoto University
-
Sasaki Misao
Yukawa Institute For Theoretical Physics Kyoto University
-
NARUKO Atsushi
Yukawa Institute for Theoretical Physics, Kyoto University
-
Naruko Atsushi
Yukawa Institute For Theoretical Physics Kyoto University
-
SASAKI Misao
Yukawa Institute for Theoretical Physics, Kyoto University:Korea Institute for Advanced Study
関連論文
- Hamiltonian Formulation of f(Riemann) Theories of Gravity(Astrophysics and Cosmology)
- Hamiltonian Formulation of f(Riemann) Theories of Gravity
- Kaluza-Klein Braneworld Cosmology with Static Internal Dimensions(Astrophysics and Relativity)
- Born-Again Braneworld
- Stability of Q-Balls and Catastrophe(Astrophysics and Relativity)
- Signatures of spinning evaporating micro black holes(16th YKIS Conference Progress in Particle Physics 2008)
- Multi-Brid Inflation and Non-Gaussianity(Astrophysics and Cosmology)
- A Brane World in an Arbitrary Number of Dimensions without Z_2 Symmetry(Astrophysics and Relativity)
- Gradient Expansion Approach to Nonlinear Superhorizon Perturbations. II : A Single Scalar Field(Astrophysics and Relativity)
- Large Non-Gaussianity from Multi-Brid Inflation(Astrophysics and Cosmology)